Remove and reorder unused imports across the project for cleaner and more consistent code structure

backend/app/schemas/common.py

@@ -1,12 +1,12 @@
 """
 Common schemas used across the API for pagination, responses, filtering, and sorting.
 """
+from enum import Enum
+from math import ceil
 from typing import Generic, TypeVar, List, Optional
 from uuid import UUID
-from enum import Enum
-from pydantic import BaseModel, Field
-from math import ceil
 
+from pydantic import BaseModel, Field
 
 T = TypeVar('T')
 

backend/app/schemas/errors.py

@@ -3,6 +3,7 @@ Error schemas for standardized API error responses.
 """
 from enum import Enum
 from typing import List, Optional
+
 from pydantic import BaseModel, Field
 
 

backend/app/schemas/users.py

@@ -1,5 +1,4 @@
 # app/schemas/users.py
-import re
 from datetime import datetime
 from typing import Optional, Dict, Any
 from uuid import UUID